Chicago's "Homan Square" houses various police functions, but a new report claims that some arrestees are kept there "off the books". The Guardian's U.S. national security editor Spencer Ackerman, who broke the story, explains. watch

Pages

Each night, Chris Hayes partakes in lively conversations and debates with his guests. Hayes covers not only the biggest news stories of the day, but also the issues that are personally important to him including social justice and the environment.